Spring in Utah County doesn't arrive on a single day. It creeps in over six to eight weeks, with freezing nights and warm afternoons trading places well into May. That variability is exactly why a thoughtful irrigation start-up timeline matters more here than in climates with a cleaner seasonal transition.
March: Don't rush it
Utah County averages its last freeze somewhere between late March and mid-April depending on your elevation. Bench lots in Highland, Alpine, or Cedar Hills can see hard freezes into early May. Opening your system before overnight temps are reliably above freezing puts your backflow preventer and above-ground fittings at risk. If you pressurize and get a late freeze, the expansion of water in an exposed fitting can crack it.
April: The start-up window
For most valley-floor cities (Provo, Orem, Spanish Fork), mid-to-late April is generally safe for start-up. This is also peak booking season, so scheduling early gets you better windows. During start-up, we pressurize slowly, walk every zone, adjust heads that shifted over winter, and set your timer for spring run times — shorter than summer, since the lawn isn't under heat stress yet.
May: First adjustments
After a few weeks of running, walk your zones in the morning and look for dry patches, runoff, or areas where the coverage has changed. Heads can shift, settle, or get clipped by a mower. May is also when you'll first start to notice coverage gaps that weren't obvious in April's cooler weather.
June: Summer schedule
By June, heat stress ramps up and run times typically need to increase. Most Utah County lawns need more water per zone in July than in April. If your controller has a seasonal adjust or water budget feature, this is when you start increasing it. Smart controllers with weather integration will handle this automatically.